Panic exit lock



5 Sheets-Shree?l 1 PANIC EXIT LOCK Feb. 25, 1958 F11-ed March 5, 195sFeb. 25, v1958 D. N. .JEwl-:TT ETAL 2,824,440

' PANIC EXIT LocK Filed March 5, 195s 5 sheets-sheet 2 5 Sheets-Sheet 3s/'yg I PANIC EXIT LOCK D. N. JEWETT rAL Feb. 25, 195s* Filed March 5,1953 Fb. 25, 1958 D. N. JEWETT ET AL 2,824,440

PANIC EXIT Loox v Filed March 5, 195s 'slieets-sheet 4 JNVENTOR.

United States Patent yOffice 2,824,440 Patented Feb. ,25,v v1958 `PANIC.EXIT LOCK Deane N. Jewett, Fraser, `Mic`h., and' John H. Gesing,Cleveland, Ohiog'said `lewett assignor of one-half te Detroit HardwareManufacturingfCo., Detroit, Mich., a corporationof Michigan ApplicationMarch 5, 1953, Serial.No.,340,432

1 Claim. (Cl. 74P-92) This invention rel-ates to closure devices and, inparticular, to panicV exit devices or locks for doors of Apublicbuildings.

One object of this invention is tosprovide `a panic exit device or lockwhich is operated merely by the use of a key to retract the lockingbolts, without requiring the provision and operation of separate knobs,leversor the like in addition to the key, therebyeliminating'projections which catchon clothing and give an unsightlyappear-ance, as well as simplifying the construction by the use of fewerparts.

Another objec-t is to providea panic exist device-orl lock operated fromthe outside of the enclosure solely by a single lock key in a singleoperation, and which is automatica-lly self-'locking when closed eithermanually or by afconventional door check.

Another object is to provide'apanic exit vdevice or 'lock wherein thelocking bolts and their associated rods reengage bygravity afterretraction, thereby eliminating the need for the operating springsrequired in prior panic exit locks, otherthan theoptional usefof aweightcounterbalancing spring for cross arm stabilizing.

Another object is to provide a panic exit device orlock whereinthelatches and control rods vare capable ofV being mounted eitherinternally within or externally upon the door.

Another object is to provide a panicexit device which can be usedinterchangeable for either'right-hand or lefthand doors, the parts beingeither'symrnetrical or reversible without requiring separate parts forright-hand and left-hand doors.

Another kobject iis' toliprovidea `panic exit device orlock having an'improved `means lfor attaching the tubular portion of the panic bar tothe arms of the `center or Ioperating hous'ingand the support 'orhingeedge housing respectively.

Another object .is to provide; apanic exit` deviceor'lock wherein theclogging screw forsholding the panicbar in its retractedlposition-during the daytime yis incapable of accidental removalandwl'oss, which occurs frequently in prior panic hardware.

Another object is to provide a panic exit deviceorlock which is freefrom the externally-projectinglatchereleasing pins ofprior devices orlocks lof this character,fsuch pins being easily bent, broken or lost.

Another object is to provide a panic exit .device:,orz1ock, particularlyforsuchdevices or'. locks attachedexternally on the door, wherein theattachment, screws for the housing and guides are. concealed, therebyenabling the use of as many screws as are desired, :without theunsightlyappearance of such screws, this construction also enabling thepanic exit lock tobemounted ondoors with narrow stiles yet withramplerigidity.

Another object is to provide a panic exit device for lock which isoperated from outside the enclosure bya single operation of a singlelock key, instead of requiring two or more .separate operations asinprior rpanic exitlocks which must first-be unlocked byaa key andthenactuated by means of a knob' or lever, means also being provided toprevent scarring of the floor after the door is unlocked and is beingswung open.

Another object is to provide a panic exity device orlock wherein theoperating parts are mounted 4in lhousings which may be interchangeablyusedeither for internal ,or external installations within or upon thedoor respectively, thereby reducing the number of parts necessary, aswell as enabling the manufacturer and dealerto reduce their inventorieskof parts and completed assemblies.

Other objects and advantages of the yinvention Willfbecome apparentduring the course V,of the following description ofthe accompanyingdrawings, wherein:

Figure l Vis a front elevation of a door equipped -with aninternally-mounted panic exit lock according to one form of theinvention, cer-tain portions ofthe door and operating rods being omittedfor conciseness of showing;

Figure 2 is a left-hand side elevation of the doorand panic exit lockshown in Figureil;

Figure 3 is an enlarged fragmentary central vertical section taken alongthe line 3-3 inFigure 1, through the central housing and partsassociated therewith;

Figure 4 is a vertical section taken along the line 4 4 in Figure 3;

Figure 5 is a horizontal section taken along lthe yline 5 5 in Figurer3;

-Figure 6 is a fragmentary vertical section takenalong thelinelin Figure3; l

Figure 7 is an enlarged vertical sectiontaken along the line 7-7 inFigure l, through theupper bolt operating mechanism shown in itslockedposition; v

Figure 8 is an enlarged vertical section taken along the line 8-S inFigure l, through the lower bolt Yoperating mechanism shown in itslocked position;

Figure 9 is a vertical section at right angles to Figure 7, taken alongthe line 9-9 therein; v

Figure 10 is a vertical section at right angles .to Figure 8, takenalong the line lil-l0 therein;

Figure 11 is a vertical -section similar to Figure 7, but showing theparts in their unlocked` positions;

Figure l2 is a vertical section similar 'to Figure 8, but showing thepartsl in their unlocked` positions;

Figure 13 is a horizontal section taken `along theline 13-13-in Figure7;

Figure 14 is a lhorizontal 14-41'4 in Figure 7;

Figure 15 is a horizontal section taken along theline 15-15 in Figurev8;

Figure 16 is an` enlargedfragmentary vertical section taken along theline 16-16 in Figure 31 throughl the. edgek housing and parts associatedtherewith;

Figure 17 is a vertical section at right angles to Figure 16, takenalong the line 17-17 therein;

Figure 18 is an enlarged vertical 4section ftaken along the line ISL-18in Figure 16, showing the, improved means for connecting the tubularcross bar tothe cross bararms;

Figure 19 is a front `elevation ofra slight modification of the panicexit lockof Figures l to l8vinclusive, as mounted externally on thedoor, certain portions ofthe door and operating rods being alsoomittedforeconciseness of showing;

Figure'ZO isa vertical section, partlyinside elevation, taken alongtheline 'Ztl-20 in Figure 19;

section taken along theline Figure 21 is a top plan view of the upperportion ofV General descriptionk of the invention Hitherto, the lockingand unlocking of doors of public buildings, such as banks, theaters,schools, ofce buildings, governmental buildings and the like, haspresented the difficult problem of maintaining free access into and outof the building during the daytime or business hours, yet properlysecuring and safeguarding the building to prevent entrance of intrudersoutside such hours. This problem has been further complicated by thediiculty of the lock` ing and unlocking of such doors when equipped withsocalled panic hardware which automatically unlocks the door from theinside when anyone pushes against it. The mechanisms previously employedin connection with such hardware have been complicated and heavy, withthe result that the ordinary door key lacks suicient strength and thedoor locking devices exert insufficient mechanical power to actuate theheavy bolts of such panic exit locks without danger of twisting off thekey in the door lock.

The result has been that prior panic exit locks on such doors haveemployed the key and ordinary cylinder lock to merely operate a latchwhich releases the door locking bolts, the actual shifting of the boltsbeing accomplished by a second operation consisting of turning anindependent knob or lever in order to shift the bolts and unlock thedoor. These additional knobs or levers are not only unsightly and likelyto catch on the clothing of persons passing by, but also are a nuisanceto the operator in that they require the operator, after using his keyin the ordinary way, to remove his hand from the key and separatelyactuate the knob or bolt.

The present invention solves these problems by providing a panic exitlock in which the door locking bolts themselves are shifted by the doorkey so that unlocking of the door is accomplished directly in a singleoperation simultaneously with the turning of the door key without thenecessity of turning or swinging any additional knob or lever, thebolt-operating mechanism operating so smoothly that the danger oftwisting the key oi in the lock is eliminated. The invention alsoprovides mechanism which automatically latches the locking bolts whenthey are retracted, so as to prevent them from scoring or otherwisedamaging the oor or oor covering while the door is being swungopen, yetat the same time automatically unlatches the bolts so that they moveinto locking positions as the door closes the door opening. The presentinvention also operates by gravity without the need for operatingsprings.

Internally-mounted panic exit lock Referring to the drawings in detail,Figures l to 18 inclusive show a panic exit lock. generally designated3G, shown as installed in the interior of a door. generally designated31, of any suitable and conventional type. The door shown is of hollowmetal construction but the invention is also obviously applicable todoors of wood or other material where space is provided within the outerstile or vertical bar at the outer edge of the door, for receiving themechanism.v As will be seen from the description of Figures 19 to 24inclusive, the panic exit lock of the present invention is equallyapplicable to mounting on the exterior of the door.

The door 31 is of conventional construction having outer and innerstiles 32 and 33 respectively (Figure 1), the former serving to receivethe locking mechanism, including the upper and lower bolt units,generally designated 34 and 35 respectively, and the center unit orboltoperating assembly, generally designated 36, this in turn beingconnected by the panic bar unit 37 to the edge unit 38 mounted on theinner stile 33 upon which thehinges (not shown) are customarily mounted.The outer and inner stiles 33 and 34 are interconnected by the upper andlower rails 39 and 40 respectively, the Stiles 33 and 34 and rails 39and 40 forming the usual framework for receiving the center panel 41which in public buildings is usually of glass or other transparentmaterial.

Edge unit construction The edge unit 38 which supports the inner end ofthe panic bar unit 37 includes a so-called hollow edge housing 45 havingupper and lower anges 46 by which it is secured as at 47 to the innerstile 33 (Figure 16), the housing 45 on its inner side being closed by aclosure plate 48 which is recessed into the bottom thereof as at 49. Theedge housing 45 has a front Wall 50 from which a hollow boss or bracket51 extends outwardly. The housing 45 contains an oblong chamber 52 inwhich a block 53 is reciprocably mounted. The block 53 at its upper endcontains a socket 54 (Figures 16 and 17) which receives the lower end ofa compression spring 55, the upper end thereof being seated against theupper wall of the housing 45. The block 53 at its lower end and at thelower limit of its reciprocation engages the lower wall of the housing45 `as a limiting stop, and contains a recess or notch 56 extendinginwardly from one side thereof and having ared or tapered upper andlower entrance surfaces 57 and w 58 respectively.

y ears 74 (Figure l) of the bracket 51.

The housing 45 is hollow and provided with an extension 59 of thechamber 52, and is also provided with a vertical threaded bore 60 havinga larger diameter coaxial counterbore 61 at the lower end thereof.Threaded into the bore 60 is a headless stop screw 62 having its upperend 63 projecting into the chamber extension 59 while its lower end 64is provided with the usual recess 65 for receiving the ordinary screwdriver or so-called Allen wrench. The stop screw 64 is retained inposition and prevented from being lost through accidental unscrewing bya threaded stop ring or bushing 66 threaded into the counterbore 61 andhaving a bore 67 through which the above-mentioned wrench orscrew-driver may be freely inserted and removed. The stop screw 62, aswill be seen below, is actuated during the daytime to render the panicbar unit 37 temporarily inoperative, yet is rotated in the reversedirection at night or outside business hours to place the panic bar unit37 back in operation. For this reason, the frequent actuation of thestop screw 60, together with a similar companion stop screw describedbelow in connection with the center unit 36, does not result in the lossof these stop screws, as frequently occurs in prior panic hardware notequipped with the retaining bushings or rings 66.

Projecting into the recess 56 of the block 53 and engaging the taperedsurface 57 is the correspondingly tapered nose portion 70 of the innerpanic bar supporting lever 71 which is bored as at 72 to receive a pivotpin 73 extending into the aligned bores 69 in the spaced The noseportion 70 is provided with a bore 75 opening into the bore 72 at rightangles thereto and the outer end of the bore 75 opens into a threadedcounterbore 76 receiving a threaded stud or set screw 77 having anUnthreaded nose portion 78 engaging an annular retaining groove 79 inthe pivot pin 73.

The outer arm 80 of the supporting lever 71 terminates in a boss 81(Figure 18) which is recessed or countersunk yas at 82 to receive atubular panic bar 83. The inner bore 84 of the panic bar 83 receives asplit clamping ring 85 having a conical inner surface or recess 86engaged by the correspondingly conical outer surface 87 of aninternally-threaded expanding nut 38 which is threaded upon the end orthreaded shank 89 of an expanding screw 90 which passes through a hole9i of the boss 81 and is provided with the usual wrench socket or screwslot 92. By rotating the expanding screw 92 in a clockwise direction,the expanding nut 88 is drawn inwardly intol the conical recess 86 inthe split clamping ring 85, expanding the latter and widening the gap orsplit therein, This in turn tightly expands the end of the panic baij,83 against the side walls of the -struction tothe 'inner' lever 71 andis-similarly-.mounted upon the central housngl95'iof the center unit-orboltoperating assembly 36,- hence similartpartsare provided with the=same referencemumerals (Figure 3) as inthe previously-describedconstruction for ythe edge unit 38.

Thestop screw lconstruction-andfretention for the outer arm-94 isalsothe Asame asffor-the inner armf71, iand-is ltherefore similarlydesignated. TheA outer or lcentral lhousing '95, however, ist-slightlylonger than-the inner `or edge housing 45 and r instead of thereciprocating block 53and spring155'of-the. latter, ithas an elongatedchamber'f96 reciprocably receiving af-socalled-operating fork, generallydesignated 97, shown in more detail in `FigureZS. YThe fork 97isfprovidedfwith averticallydisposed elongated base 98 having upper andlower elongated lrectangular slots 99 and 100.

Immediately adjacent the lowerend oftheupper slot 99 and the upper endof the lower-slot.100,lthe ibase 98 is provided with a pair oftransverse ribs or ridges 101 `and 102 respectively. yProjectingoutwardly lfrom 'the base y98 at its opposite ends adjacent the'outerends of theslots 99- and 100 are-upper andlower larms1-03`and 104respectively,`lthese having reducedywidth'end portions 105 and 106respectively (Figure 25). The reduced width portions 105 and106-areoffset in the same direction-and the 'upperand lower. slots 99and 100land ribs or ridgesll and102 are disposed symmetrically with respectto'the center of the base `98,- so thatithe fork 97 may be usedieitherfor a right-handl or left=hand door `merely rby being inverted v:fromthe position shownin Figures 3, and 25.

The tapered lnose portion or vinner-arm-70 of-the outer panic barsupporting -lever 94,instead of-,engaging the walls-fof the'recess 56 inthe yblock 53\as..inFigures 16 and l7, engages onef'end-of onel of theslots 99 or 100, whichever happens to be lowermost. Only one of theseslots is in use'at a given time, because of the provision forinterchangeability inA right-hand and left-hand operation. The'fork'97fis also shiftedverticallyfbyttheuengagement of the crank pin'110k(Figures 3 and f4) 'on the outer Aend of .a crank '111, the hub 112 ofwhich is journaled in' a-"bore 113 in amounting plate114 secured as at115 to'thefinner wall 117 of theiouter stile 34. The hub `112.is"held inposition bya snap ring'V 118 engaging an annularffgroove '119thereiniand. seated in a counterbore 120 in theimountingplate 114'zatfthetinner end .of/the bore 113. The crank v111 isLprovided with avcross-shaped aperture 121 for receiving .a conventionalmotion-transmitting member 122,"usually in 4the form of anfelongatedat'metal strip which at its other end engagesa recess123 in the outputmember 1,24 of aconventional 'rim lock cylinder, generally designated12S (Figure u3). Theihub 112 is provided witha couuterbore126extending'inwardly to the cross-shaped apertured 121andjoinsnit;atitheibottoml127 of the'counterbore 126. rIlhe rim lock'cylinderi125 is conventional and its details'.v are outside the-scope'of the" present invention.

Itismountedias usual in a hole 128 inthe outer wall 1291er theouter'stilei34 and has aniescutcheon plate or disc l130'through .whichthe key-receiving'portion 131 projects. VThe key-receiving portion `131as its name indicateslisordinarily in the'form of a cylindrical'plugwith azfdiametrical key recess congured to receive the ordinary key (notshown) by which the panic exit lock isnot only unlatched but alsoactuated from outside theenclosure in gaining entrance by a key.

Lower bolt unit construction "Secured as at 135 tothe wall 117 of thestile 34.0fthe door-31,isa-'channel-shaped lower boltk housingA 136(Figures 8 Aand-l5), .the opposite sides of which are vertically.slotted as at 137 to receive the opposite ends of a pin ,138 carryingspaced washers 139 between vwhich lis lmounted the lower bolt-operatingrodV 140 having a transverse'holef141 inwhich-the pin 138 is seated. The

lupper endof the rod4 140 is threaded as at 142 to .enterthecorrespondingly-threaded socket 143 (Figure 3) in `like lowerhe-ad147. The head 147 is. provided with a notch 143 extending inwardly fromone side thereof and 'oosely receiving-the reduced width outer end 106of the lower arm 104of the operating'fork 97 (Figure 3). The notch 148vertically 4is-considerably wider than the end 106 to allow independentmotion therebetween.

The lower endof the rod 140 is slotted as at 149 (Figure l0) fanddrilledtransversely as at 150 to receive a pivot pin 151-upon-which the upper.end of a link 152 is pivotally supported in the slot 149, the link 152being suitably bored las at 153 for the passage of the pin 151.The'lower end of the link 152 is similarly bored as at 154 to receive apivot pin 155, the ends of which are seated in aligned bores 156 inspaced ears 157 onthe upper side-of a swinging lower bolt 158. The

lower bolt'158 is bored as at 159 to receive a pivot pin 160, theopposite ends of which are seated in aligned bores 161 (Figures 10 and15) in the opposite side walls ofthe channel-shaped housing 136. Thebores 161 are so located relatively to the bottom of the housing 136andthe latter soy located adjacent the bottom of the ls'tile'34 of thedoor 31 thatthe bolt 158 swings downwardly intothe projecting positionof Figure 8 and is retracted upwardly into the position shown in Figurel2. Tire housing i136 viits into the chamber 162 in the interior of theouteror lock stile 34 (Figure l5). In its `downward or locked position,the bolt 158 engages the recessed lower keeper 164 (Figures l and 2)which is seated in and Iiush with the oor.

Upper bolt'unt construction Secured as at 165 to the inner wall 117 ofthe outer stile 32 within the upper end of the chamber 162 thereof isthe upper bolt housing 166 (Figures 7 and 13). The latter is of channelshape similar to the lower bolt housing 136. Projecting into the spacebetween the side walls of the housing 166 is the upper "end of the upperboltoperating rod 167, the lower end of which is4 threaded as at 168 toenter the correspondingly threaded socket 169 in a tubular coupling 170somewhat similar to the coupling'144 and similarly havinga threadedprojection 171 on the closed end thereof threaded into acorrespondinglyv threaded socket 172 in a block-like upper head 173.Thefhead 173 has a notch 174 extending inwardly from one side thereofand this notch loosely receives the reduced width end portion 105 of theupper arm 103 of the operating fork 97.

The upper end of the rod 167 is transversely bored (Figure 14) as at 175to receive a cross pin 176, the opposite ends of which project outwardlybeyond the rod 167. The oppositeends of the'pin 176 are guided inaligned vertically-elongated*slots 177 in the side walls of thechannel-shaped'housing 166. The opposite side walls of thechannel-shaped housing 166 near their lower ends are provided withaligned bores 180 in which a pivot pin151 is seatedat its opposite ends.Pivotally mounted asfat 179 near one'end of the pivot pin 181 .is anupperbolt-operating lever 182 of roughly triangular shape (Figures 7andV ll). Intermediate its upper and lowerends, the bolt-operatingv-lever 182 is provided with an upwardly-inclined.notch 183 slidablyreceiving one end of thecross pin 176. As a consequence, when the upperbolt-operating rod 167.isreciprocated vertically by the fork 97, itswings the upper bolt-operatinglever 'the pivot pin 192.

7 182 in one direction or the other around the pivot pin 181 by reasonof its engagement with the notch 183.

The upper end of the bolt-operating lever 182 is pro vided with avertically-elongated slot 185 which is engaged by a pin 186 guided in anarcuate slot 187 in one of the side walls of the channel-shaped housing166 (Figure 1l). The pin 186 is mounted in a transversely bored boss 189(Figure 9) which projects downwardly from the lower side of the upperbolt 190 which is bored as at 191 to receive a pivot pin 192, theopposite ends of which are mounted in aligned bores 193 (Figure 9) inthe opposite side walls of the channel-shaped housing 166. 1n thismanner, as the upper bolt-operating rod 167 moves upward or downward inresponse to the reciprocation of the operating fork 97, it acts throughthe linkage between the pin 176 in notch 183 and the bolt-operatinglever 182 lo swing the latter inward or outward around the pivot pin 181and thus swing the upper bolt 190 upward into its locking position(Figure 7) or downward into its unlocked position (Figure 1l).

In order to latch the upper and lower bolts 190 and 158 in theirretracted positions so as to prevent scarring of the tloors, door frameor other parts as the door is swung open after being unlocked, the upperbolt unit 34 is provided with a latch lever` 195 (Figures 7 and 1l)which, like the upper bolt-operating lever 182, is roughly in the shapeof a triangular plate, and likewise bored as at 196 to pivotally receivethe pivot pin 181. The

`lowermost portion 197 of the latch lever 195 extends downwardly belowthe bore 196, whereas the upper edge 198 thereof is provided with aninclined cam portion 199 above which is a vertical edge portion 200leading to a notch 201 releasably receiving one end of the pin 176carried by the rod 167. The extreme upper end 202 o the latch lever `195(Figures 7 and ll) is rounded to engage the similarly rounded projection203 extending downwardly from the lower edge of a latch-releasing leveror pivoted dog 204 which is` pivotally mounted on In its upward orlocked position, the upper bolt 190 engages the recessed upper keeper286 (Figures l and 2) which is seated in and llush with the door framehead jamb.

LxernaIIy-nzounted panic exit lock The externally-mounted panic exitlock, generally desig- `nated 230, shown in Figures 19 to 24 inclusive,is of generally similar construction to the panic exit lock of Figures lto 18 and 25, but diters in certain details for mounting upon the innerside surface 231 of the outer or lock stile 232 of a door, generallydesignated 233, having an inner or hinge stile 234 and upper and lowerrails 239 and 240 interconnecting the same and framing a panel 241 ofglass or other suitable material. The form of the invention shown inFigures 19 to 25 inclusive is suitable for mounting upon a solid door,such as a wooden door, lacking an internal chamber for aecomrnodatingthe mechanism. The center unit 236, panic bar unit 237 and edge unit 238are of generally similar construction to the corresponding units 36, 37and 38 of the internally-mounted panic exit lock 30, the units 237 and238 being of substantially 'identical construction thereto andconsequently bearing the same reference numerals for similar parts. Thetop jarnb and floor are recessed to receive upper and lower keepers242and 243 respectively, the former having a downwardly-projectingoperating lug 244.

The outer or central housing 245 which corresponds to the housing 95 ofFigure 3 and apertures 246 and 247 in the lower and upper ends thereof.An operating fork 248 (Figure 20) of somewhat dierent construction fromthe operating fork 97 (Figure 3) is reciprocably mounted within thechamber 249 in the housing 245 and has an upper ledge 250 at its upperend threaded as at 251 to receive the threaded lower end 252 of atubular coupling 253.

Upper bolt unit construction The upper end of the coupling 253 isinternally threaded as at 254 to receive the threaded lower end 255 ofthe Vupper bolt-operating rod 256, the upper threaded end 257 of whichis threaded into a correspondingly threaded socket 258 of a tubular head259. The head 259 is bored transversely to receive a cross pin 260 whichreciprocates vertically in guide slots 261 (Figures 19 and 20) in theopposite side walls of an upper bolt housing 262 of U- shapedcross-section. Also mounted in the head 259 and extending across a slot263 in the upper end thereof is a pivot pin 264 upon which is pivotallymounted the lower end of a link 265, the upper end of which is bored toreceive a pivot pin 266 similarly mounted in the hole 267a in the boss267 of the upper bolt 268 which is slotted as at 269 to receive the link265. The upper bolt 268 is bored to receive a pivot pin 270 which ismounted in bores 271 in the opposite side walls of the housing 262. Theupper bolt 268 is provided with an additional hole 272 to make itinterchangeable with the lower bolt described below.

The opposite side walls of the housing 262 are also bored to receive andsupport a headed pivot pin 273 upon which is pivotally mounted a roughlytriangular latch lever 274 having a hook portion or ledge 275 at itslower end and an arm 276 projecting upwardly from its upper end. Thethird corner portion 277 is rounded and extends outwardly, away from thepivot pin 273, providing a counterweight effect to swing the hook 275 tothe left under the influence of gravity (Figure 20). The lever 274 ismounted between bosses 278.

Thehousing 262 at the opposite edges of its side walls is provided withparallel vertical ribs 279 which are notched intermediate their ends asat 280 (Figure 24). The ribs 279 engage corresponding grooves 281 in amounting plate 282 which is secured as at 283 to the inner surface 231of the door 233. Pins 284 extend through the suitably bored side wallsadjacent the grooves 281 of the mounting plate 282 and enter the notches280 (Figure 24), securing the assembly in position so that the screws283 are completely concealed.

Lower bolt unit construction The fork 248 immediately adjacent the ledge250 is provided with a vertically-elongated approximately rectangularaperture 285, at the lower end of which there is a laterally-projectingridge 286 corresponding to the ledge or ridge 101 (Figure 3) of the fork97 and similarly intended for engagement by the crankpin of thekey-operated crank 111 of the cylinder lock 125, as described inconnection with Figure 3. The lower end of the fork 248 is provided withan upwardly-extending elongated notch 287, the upper end 288 (Figure 23)of which is engaged by the nose portion 70 of the panic bar supportinglever 94, as in Figure 3. The lower end of the fork 248 is thusbifurcated, with lingers 289 extending laterally inward parallel to theledge 250 and ridge 286. The lingers 289 extend on opposite sides of alower head 290 and engage laterally-projecting shoulders 291 thereon(Figure 22) on an extension 292 of the head 290 and containing avertically-elongated slot 293 which also receives the tapered noseportion 70 of the panic bar supporting lever 94 (Figure 20) after it haspassed through the notch 287. The slot 293 is considerably longervertically than the vertical height of the end of the nose portion 70 inorder to provide compensation between the top and bottom latchassemblies so as to permit independent locking action of the upper andlower bolts 268 and 306 such as, fior example, if the lower keeperbecomes clogged with irt.

The lower head 290 is provided with an internallythreaded socket 294which receives the threaded upper end 295 of the lower bolt-operatingrod 296, the lower end 297 of which is similarly threaded and threadedlyengages a. correspondingly-threaded socket 298 in a coupling.299. Thelowerend of the coupling/.299 is slotted as at 300 and transverselydrilled to receive a pivot pin 301 which passes through thecorrespondingly bored upper end of a link 302. The correspondingly boredlower end of the link 302 receives a pivot pin 303 (Figure 19) extendingvthrouglrholes 304 in the boss 305 on the upper side of the lower bolt306 andy having a notch 307 therein. VThe holes'304 in the lower bolt306 correspond to the holes '272 in the upper bolt 268, with which it isinterchangeable. "The lower bolt 306 isbored as at 308 to receive apivotpin 309 mounted at-its opposite ends in bores`310 in'the `opposite sidewalls of the lower housing 311. "Thelower bolt 306 also has a boss 312containing a hole '313 which corresponds to the hole 267:1 in theinterchangeable upper bolt 268.

Operation `1`he :operation of the invention isgenerally the same whetheritis embodiedpin the internally-mounted panic exitlockof-Figures l'to 18inclusive or in the externallymounted panic exit lock'ofFigures 19 to 24inclusive, the two embodiments differing in operation only in minordetails. Considering first the internally-mounted panic exit lock `30,letit beassumed that it is applied to the interiorot` adoor 31 ofapublic building, such as a bank, but that the building has closed forthe day and is for the time being `open only to persons provided withthe properkey forthe cylinder lock 125. `Since the buildingiscl'osedl tothe public, at closing time an employee has `applied :a suitable wrenchto'the stop screws 62 to lower them in their threaded bores 60untilth'ey encounter the'threaded retaining bushings 66. This actionpermits the panic bar unit 37 to be swung into operating position ofFigures 2, 3 and 16 by L.the spring 55 (Figure 16). The threadedretaining bushings 66, however, prevent loss of the stop screws 62-whichin conventional panic barlunits of -prior design occurs frequentlybecause of these screws being actuated at least twice daily in openingthe'. building for business and inclosing it to the public at *.night.'At opening time, the stop screws k6) are of course rotated to move themand the forward arms 70 of thepanicbar supporting leven-94 upwardintoinoperative ,position wherein the panic bar 83vmoves closer to thedoor and does not actuate the lock because at this time the lock islatche'd out of lockingposition, as will appearmore fully fronmthediscussion below.

With the parts in the positions shown Vin Figures l, 2, 3, 7'and 18, thebuilding being closed tothe public, the lock bolts S-and 190 are swungdownward and upward respectivelyinto their respective recesses 164 and206 by the weightof the rods 140 and 167 vand .their 'connectedmechanisms, under the force of gravity. An authorized person, seeking tounlock the door311ror 231 inserts the proper'key in the cylinder lock125 and rotates'it in the usual manner, this rotational motion beingtransmitted through'the member 122 ,(Figure 3) `to the crank 111,swinging the latter against the abutment 101 (Figure 3) or 286 (Figureand thereby moving the operating fork 97 or 248 upward.

The upward motion of the operating fork 97 causes its arms 105 and 106to lift the upper and lower heads 173 and 147 respectively, carryingwith them the upper and lower rods 167 and 140 respectively. The upwardrnotion of the lower rod 140, acting through the link 152, swings thelower bolt 158 upward out of its lower keeper 164, unlocking the lowerend of the door. The upward motion of the upper rod 167 and its crosspin 176 causes the latter to exert a camming effect upon theupwardlyinclined notch 183 in the bolt-operating lever 182, swinging thelatter in a clockwise direction around its pivot pin 181 from theposition shown in Figure 7 to that shown in Figure 1l. As a consequence,the engagement of the elongated slot 185 in the upper end of thebolt-operating lever 182 with the end of the pin 186 mounted in thedepending boss 189 of the upper bolt 190 swings the upper bolt 190downwardly arounditspivotpinr192 in 'alcouterclockwise direction fromkthe position shown. in Figure 7 to that shown in Figure 11, withdrawing,the `upper' bolt 190 from its recessed upper keeperf206 (Figures 1 and2) and unlocking theupper end of the door as weil;

Meanwhile, as the cross pin 176 in the upper end of the upperbolt-operating rod 167 moves upward, as described above in unlocking'the door, it ymoves upward past the vertical portion 200 of the latchlever `195 to the top thereof, permitting the-latch'lever 195 to swingdownwardly by gravity in a counterclockwise direction around its pivotpin 181 as the cross pin 176 .cornes opposite the notch 201 in the lever195 4(Figure 11). As a result of this motion, the upperendv 2'02of thelatch lever 195 pushes' to the left the projection 203 depending fromthe latch-releasing lever or dog 204, swinging the latter upward in aclockwise direction around its pivot pin 192 as the door' 31 is swungopen. Thus, even when vthe operator removes his key from the cylinderlockvafter performingthe foregoing unlocking operation, the upper rod167 will remain in Vits raised yposition with the cross pin 176 restingin thenotch 201 of thelatch lever 195, likewise holding the-lower rodand lowerbolt 158 in their raisedpositions through the connectionbetween the upper and lower rods 167 and 140 afforded by the operatingfork'97. 1n this manner, the upper and lower bolts 190 and 1.58 arelatched in their unlocked or retracted positio-ns of Figures 1l and 12respectively, as the door is swung open .by the operator, therebypreventing scarring theioor or other damage.

After the operator has passed through the doorway and the door31'isagain swungk into its closed position, either bythe operator or by aconventional door check, as the door '31 Vreaches its closed position,the latch-releasing lever'204 engages the upper keeper 206 and is pusheddownwardly thereby in afcounterclockwise direction from the Aposition ofFigure 1l to theposition of Figure 7. This action causes the projection203 to swing the upper end 202 of the latching lever 19S to the rightrotating the latter in a clockwise direction around its pivot 181 andwithdrawing the notch 201from beneath the cross pin 176 on the upper rod.1'67. Whenthus released, the upper rod 167 drops downward and at thesame time its cross pin 176 engages and cams the upwardly inclined notch183 on the bolt-operating lever 182 to swing the latter in acounterclockwise direction around its pivot 181. The consequentengagement of the upper end slot 185 of the bolt-operating lever 182with the pin 186 onthe bolt projection 1897swings the upperbolt upwardlyin a clockwise direction around its pivot pin 192 and engages it withtherecessedupperkeeper 206, relocking the upper end of the door 31 in itsclosed position.

Meanwhile, the dropping of the upper rod 167 in the above-describedmanner permitsthe operating fork 97 to drop (Figure 3), the. downwardmotion of ythe lower arm 106 thereof .permitting the'lower rod 140 todrop under the iniluenceof gravity. This action, transmitted through thelink 152, swings the lower bolt 158 downwardly around its pivot pin 160into engagement with the recessed lower keeper 164, locking the lowerend of the door 31. In this manner, the door is automatically relockedat both its upper and lower ends when it swings into its closed positionin its doorway. The vertically widened notch 148 in the lower head 147permits the lower rod 140 and lower bolt 158 to move upwardlyindependently of the operating fork 97 to permit independent lockingaction of the upper and lower latch assemblies.

The operation of the externally-mounted panic exit lock 230 occurs in asimilar manner to that described above 'for the internally-mounted panicexit lock 30. As the fork 248 is moved upward in response to therotation of the crank 110 against the ridge 286 as the result of therotation of the key in the cylinder lock 125 by the operator, theconsequent upward motion of the upper boltoperating rod 256 (Figure 20)swings the upper bolt 268 downwardly around its pivot pin 270 in acounterclockwise direction as a result of the motion-transmitting effectof the link 265 interconnecting the pivot pins 264 and 266. As the crosspin 260 on the upper end of the upper head 259 moves upward, it exerts acamming action on the inclined lower edge of the hook portion 275 of thelatch lever 274, pushing the hook portion 275 aside to the right (Figure20) and swinging the latch lever 275 counterclockwise around its pivotpin 273. As soon as the cross pin 260 passes by the end of the hookportion 275, however, the latter moves underneath the cross pin 260 inresponse to the action of gravity upon the latch lever 274, latching theupper rod 256 in its raised position.

The same upward motion of the operating fork 248 lifts the lower rod 296through the engagement of the fingers 289 with the laterally-projectingshoulders 291 on the lower head 290 (Figures 20 and 22), swinging thelower bolt 306 upward into its retracted position through theintermediate action of the link 302. Thus, both the upper and lowerbolts 268 and 306 are latched by the hook portion 275 of the latch lever274 in their retracted or unlocked positions.

The bolts 268 and 306 are released and the door 231 relocked when thedoor nears its closed position by the engagement of the lug 244projecting from the upper keeper with the upper arm 276 of the latchlever 274, swinging the hook portion 275 out from beneath the cross pin260 and consequently releasing the upper rod 256 and operating fork 248,permitting them to drop downward. As a consequence, the upper bolt 268is swung upward into its keeper through the intermediate action of thelink 265, whereas the lower bolt 306 is permitted to swing downward intoits respective keeper by the downward motion of the lower rod 296 andlink 302 permitted by the downward motion of the lingers 289 engagingthe shoulders 291 on the lower head 290, relooking the door in itsclosed position.

Meanwhile, if a lire or other emergency occurs inside the building whilethe door 31 or 231 is locked, a person seeking to unlock the door fromthe inside merely needs to lean against the panic bar 83 of the panicbar unit 37 or 237, pushing the latter toward the door and consequentlyswinging the panic bar supporting levers 71 clockwise around their pivotpins 73. This action swings the forward portion or arm thereof upward,lifting the operating fork 97 or 248 and actuating the abovedescribedmechanism to raise the upper and lower operating rods 167 and 140 or 256and 296 to retract the tions of the panic bar supporting levers 94upward and unlocking the device in the same manner just described above,but holding the mechanism in its unlocked position. The door can thus beswung freely open without interference by the lock during businesshours.

What we claim is:

A lock bolt-shifting mechanism for a hollow door having a chambertherein and a key-actuated rim lock cylinder projecting into the chamberand also having a panic-bar-operated exit lock with upper and lower lockbolts, said bolt-shifting mechanism comprising verticallydisposed upperand lower bolt-shifting rods reciprocably mounted in the chamber of thedoor respectively above and below the rim lock cylinder and extendingtoward one another and operatively connected to said upper and lowerlock bolts respectively, a housing mounted on the door, a rod couplingdevice including a vertically-disposed elongated base reciprocablymounted within said housing and vertically-spaced upper and lower armsprojecting substantially horizontally from said base into the doorchamber above and below the rim lock cylinder and connected respectivelyto said upper and lower rods, said base having a pair of spaced parallelabutments disposed transversely thereon, a panic bar supporting leverpivotally mounted on said housing and operatively engaging one of saidabutments, and motion-transmitting means operatively connected to therim lock cylinder and operatively engaging the other of said abutments,said coupling device being selectively movable in response to the motionof the rim lock cylinder by the door key and of said panic barsupporting lever by the panic bar to shift said rods and bolts.

References Cited in the file of this patent UNITED STATES PATENTS958,353 Arens May 17, 1910 1,047,900 Voight Dec. 17, 1912 1,130,266 GoldMar. 2, 1915 1,163,795 Voight Dec. 14, 1915 1,180,024 Dyer Apr. 18, 19161,203,965 Bogenberger Nov. 7, 1916 1,225,795 Frazer May 15, 19171,324,181 Smith Dec. 9, 1919 1,357,007 Smith Oct. 26, 1920 1,458,013Tampier June 5, 1923 1,496,319 MacDonald June 3, 1924 1,518,187 DyerDec. 9, 1924 1,585,167 Palmer May 18, 1926 1,613,023 Diete Jan. 4, 19271,639,086 Frederick Aug. 16, 1927 1,898,505 Soemer Feb. 21, 19331,990,898 Forman Feb. 12, 1935 2,128,116 Boone Aug. 23, 1938 2,222,667Kitzelman Nov. 26, 1940 2,457,697 Lum Dec. 28, 1948

